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# End of Avahi example code
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class Client(object):
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class Client(dbus.service.Object):
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"""A representation of a client host served by this server.
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name: string; from the config file, used in log messages
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secret: bytestring; sent verbatim (over TLS) to client
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host: string; available for use by the checker command
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created: datetime.datetime(); object creation, not client host
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last_checked_ok: datetime.datetime() or None if not yet checked OK
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timeout: datetime.timedelta(); How long from last_checked_ok
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until this client is invalid
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_timeout_milliseconds: Used when calling gobject.timeout_add()
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_interval_milliseconds: - '' -
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interface = u"org.mandos_system.Mandos.Clients"
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@dbus.service.method(interface, out_signature="s")
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"D-Bus getter method"
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@dbus.service.method(interface, out_signature="s")
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def getFingerprint(self):
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"D-Bus getter method"
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return self.fingerprint
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@dbus.service.method(interface, in_signature="ay",
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def setSecret(self, secret):
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"D-Bus setter method"
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def _set_timeout(self, timeout):
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"Setter function for 'timeout' attribute"
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"Setter function for the 'timeout' attribute"
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self._timeout = timeout
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self._timeout_milliseconds = ((self.timeout.days
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* 24 * 60 * 60 * 1000)
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+ (self.timeout.seconds * 1000)
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+ (self.timeout.microseconds
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timeout = property(lambda self: self._timeout,
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self.TimeoutChanged(self._timeout_milliseconds)
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timeout = property(lambda self: self._timeout, _set_timeout)
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@dbus.service.method(interface, out_signature="t")
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def getTimeout(self):
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"D-Bus getter method"
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return self._timeout_milliseconds
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@dbus.service.signal(interface, signature="t")
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def TimeoutChanged(self, t):
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def _set_interval(self, interval):
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"Setter function for 'interval' attribute"
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"Setter function for the 'interval' attribute"
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self._interval = interval
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self._interval_milliseconds = ((self.interval.days
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* 24 * 60 * 60 * 1000)
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+ (self.interval.microseconds
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interval = property(lambda self: self._interval,
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self.IntervalChanged(self._interval_milliseconds)
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interval = property(lambda self: self._interval, _set_interval)
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del _set_interval
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@dbus.service.method(interface, out_signature="t")
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def getInterval(self):
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"D-Bus getter method"
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return self._interval_milliseconds
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@dbus.service.signal(interface, signature="t")
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def IntervalChanged(self, t):
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def __init__(self, name = None, stop_hook=None, config=None):
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"""Note: the 'checker' key in 'config' sets the
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'checker_command' attribute and *not* the 'checker'
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dbus.service.Object.__init__(self, bus,
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% name.replace(".", "_"))
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if config is None:
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self.host = config.get("host", "")
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self.created = datetime.datetime.now()
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self.last_checked_ok = None
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self.timeout = string_to_delta(config["timeout"])
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self.interval = string_to_delta(config["interval"])
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self.stop_initiator_tag = None
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self.checker_callback_tag = None
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self.check_command = config["checker"]
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"""Start this client's checker and timeout hooks"""
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# Schedule a new checker to be started an 'interval' from now,
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# and every interval from then on.
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self.checker_initiator_tag = gobject.timeout_add\
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self.stop_initiator_tag = gobject.timeout_add\
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(self._timeout_milliseconds,
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self.StateChanged(True)
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@dbus.service.signal(interface, signature="b")
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def StateChanged(self, started):
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The possibility that a client might be restarted is left open,
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but not currently used."""
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# If this client doesn't have a secret, it is already stopped.
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if hasattr(self, "secret") and self.secret:
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"""Stop this client."""
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if getattr(self, "started", False):
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logger.info(u"Stopping client %s", self.name)
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if getattr(self, "stop_initiator_tag", False):
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self.stop_checker()
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if self.stop_hook:
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self.stop_hook(self)
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self.StateChanged(False)
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# Do not run this again if called by a gobject.timeout_add
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Stop = dbus.service.method(interface)(stop)
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def __del__(self):
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self.stop_hook = None
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def checker_callback(self, pid, condition):
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"""The checker has completed, so take appropriate actions."""
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self.checker_callback_tag = None
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and (os.WEXITSTATUS(condition) == 0):
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logger.info(u"Checker for %(name)s succeeded",
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self.CheckerCompleted(True)
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self.bump_timeout()
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elif not os.WIFEXITED(condition):
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logger.warning(u"Checker for %(name)s crashed?",
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self.CheckerCompleted(False)
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logger.info(u"Checker for %(name)s failed",
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self.CheckerCompleted(False)
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@dbus.service.signal(interface, signature="b")
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def CheckerCompleted(self, success):
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def bump_timeout(self):
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"""Bump up the timeout for this client.
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This should only be called when the client has been seen,
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gobject.source_remove(self.stop_initiator_tag)
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self.stop_initiator_tag = gobject.timeout_add\
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(self._timeout_milliseconds, self.stop)
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bumpTimeout = dbus.service.method(interface)(bump_timeout)
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def start_checker(self):
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"""Start a new checker subprocess if one is not running.
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If a checker already exists, leave it running and do
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self.checker_callback_tag = gobject.child_watch_add\
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(self.checker.pid,
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self.checker_callback)
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self.CheckerStarted(command)
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except OSError, error:
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logger.error(u"Failed to start subprocess: %s",
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# Re-run this periodically if run by gobject.timeout_add
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@dbus.service.signal(interface, signature="s")
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def CheckerStarted(self, command):
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@dbus.service.method(interface, out_signature="b")
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def checkerIsRunning(self):
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"D-Bus getter method"
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return self.checker is not None
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def stop_checker(self):
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"""Force the checker process, if any, to stop."""
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if self.checker_callback_tag:
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if error.errno != errno.ESRCH: # No such process
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self.checker = None
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StopChecker = dbus.service.method(interface)(stop_checker)
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def still_valid(self):
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"""Has the timeout not yet passed for this client?"""
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now = datetime.datetime.now()
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if self.last_checked_ok is None:
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return now < (self.created + self.timeout)
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return now < (self.last_checked_ok + self.timeout)
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stillValid = dbus.service.method(interface, out_signature="b")\
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def peer_certificate(session):